Sustainability aspects, inventory, comparisons

Transcription

1 Sustainability aspects, inventory, comparisons Milan Veljkovic University of Lulea Helena Gervásio University of Coimbra

2 Contents Introduction to life cycle thinking Life cycle assessment of construction works Sustainability and LCA of steel structures Case studies LCA of steel products: Examples 1 to 3 LCA of a steel building: Example 4

3 Sustainability of buildings Material selection (structural engineering) important for future, COM 571, after 2020 near zero energy structural safety and heat transfer Operational costs (other engineering disciplines), present state energy consumption: HVAC and lightening (70%) 37% of total EU energy consumption living environment comfort level, simulation software

4 Sustainability of buildings OPERATIONAL ENERGY vs. EMBODIED ENERGY Source: Gervásio et al. (2010)

5 Eurocodes Design of steel buildings with worked examples Brussels, October 2014 Main goal: LCA of steel products LCA of a steel building Sustainability aspects, inventory, comparisons M. Veljkovic & H. Gervásio

6 Life Cycle Analysis Tool Available from AppStore for ipadand iphone and GooglePlay for Androids

7 Introduction to life cycle thinking

8 SUSTAINABLE DEVELOPMENT Sustainable Development meets the needs of the present without compromising the ability of future generations to meet their own needs In World Commission on Environment - Brundtland Report (1987) Environmenta l Cultural Sustainable Development Political Social Spiritual Economical

9 SUSTAINABILITY INDICATORS Earth population Population size fluctuates at differing rates in differing regions. Nonetheless, population growth is the long-standing trend on all inhabited continents, as well as in most individual states. Estimates of population evolution between 1950 and 2050, according to the UN. Millions of people (log) During the 20th century, the global population saw its greatest increase in known history, rising from about 1.6 billion in 1900 to over 6 billion in Sources: nationalgeographic.com,

10 SUSTAINABILITY INDICATORS Earth carrying capacity Sources: UN Human Development Index, nationalgeographic.com

11 SUSTAINABILITY INDICATORS Earth carrying capacity Between 1980 and 2007, global resource extraction grew significantly, by almost 62%. About one half of the forests that once covered the earth has disappeared. In some locations, societies have outstripped the carrying capacity of the land, resulting in chronic hunger, environmental degradation and large-scale exodus of desperate populations.

12 SUSTAINABLE CONSTRUCTION Sustainable Construction results from the application of the principles of Sustainable Development to the global cycle of construction, from raw material acquisition, through planning, design, construction and operation, to final demolition and waste management. Chrisna du Plessis Agenda 21 for Sustainable Construction in Developing Countries credits to stalkretsloppet.se

13 Life cycle assessment of construction works

14 ASSESSMENT OF SUSTAINABILITY IN CONSTRUCTION Life Cycle Analysis (LCA) Evaluation of potential environmental impacts of a product, process or activity throughout its entire life INPUTS Raw materials OUTPUTS Air emissions Water emissions Energy Emissions to soil Waste Source: stalkretsloppet.se

15 ASSESSMENT OF SUSTAINABILITY IN CONSTRUCTION LIFE CYCLE ANALYSIS The environmental impacts of buildings occur throughout all life cycle stages of a building or other construction; To overcome the shifting of burdens from one life cycle stage to another when deciding between options, the life cycle perspective needs to be taken into account; New international standards for sustainability assessment of buildings under development follow a life cycle approach.

16 LIFE CYCLE ANALYSIS INFLUENCE OF DESIGN DECISIONS ON LIFE CYCLE IMPACTS AND COSTS

17 LIFE CYCLE ANALYSIS Life cycle environmental analysis according to the general framework of ISO 14040:2006 and ISO 14044:2006 Goal and scope definition Inventory analysis Interpretation Impact assessment

18 LIFE CYCLE ANALYSIS 1 st stage Definition of goal and scope of the analysis Function(s) of the system Functional unit Definition of the system System boundaries Allocation procedures Type of impacts and assessment methodologies Data quality requirements Assumptions and limitations Critical review Type and format of report

19 LIFE CYCLE ANALYSIS FUNCTIONAL UNIT A functional unit is a measure of the performance of the functional outputs of the product system. Product level e.g.: A simple supported column, 10 m long, with a load bearing capacity of an axial force of 5000 kn. Building level e.g.: An office building providing a workplace and working environment for 100 workers and designed for a service life of 50 years.

20 LIFE CYCLE ANALYSIS SYSTEM BOUNDARY The system boundaries determine which unit process shall be included within the LCA. Raw material supply Manufacturing Construction Operation Demolition Recycling Cradle to gate Cradle to grave Cradle to cradle

21 LIFE CYCLE ANALYSIS Functional unit: Solution Type Material(s) Section 1 Circular hollow Steel (S355) section 35 2 Circular hollow HSS (S690) section 25 3 Steel profile Steel (S355) HD 4 Steel profile HSS (S690) HD 5 Composite Steel circular section (S355)/Concrete 35 6 Composite circular section HSS (S690)/Concrete A simple supported column, 5 m long, with a load bearing capacity of an axial force of 5000 kn and a bending moment of 100 knm (around the strong axis for the profile column). 25 Source: Rossi et al. 2010

22 LIFE CYCLE ANALYSIS 12,000 10,000 8,000 6,000 Solution Type Material(s) Section Steel mass 1 Circular hollow section Steel (S355) kg 2 Circular hollow section HSS (S690) kg 3 Steel profile Steel (S355) HD kg 4 Steel profile HSS (S690) HD kg 5 Composite circular section Steel (S355)/Concrete kg 6 Composite circular section HSS (S690)/Concrete kg Energy consumption (MJ) GWP 100 kg CO2 eq ,000 2,000 0 Section 1 Section 2 Section 3 Section 4 Section 5 Section 6 Cradle-to-gate Cradle-to-grave Section 1 Section 2 Section 3 Section 4 Section 5 Section 6 Cradle-to-gate Cradle-to-grave

23 LIFE CYCLE ANALYSIS 2 nd stage Inventory analysis

24 LIFE CYCLE ANALYSIS SYSTEM BOUNDARY OF STEEL (worldsteel): Source: Worldsteel (2011)

25 LIFE CYCLE ANALYSIS

26 LIFE CYCLE ANALYSIS

27 LIFE CYCLE ANALYSIS 3 rd stage Life Cycle Impact Assessment (LCIA) Mandatory elements Selection Classification Global warming, Acidification, Eutrophication, Fossil fuel depletion, Criteria air pollutants, Human health, Smog formation, Ecological toxicity, Water intake, Ozone depletion,.. Characterization IA jk n Iij i 1 IAfactor i Optional elements Normalization Weighting IAScore jk IA jk IVwt Norm EnvScore j IAScore jk p k 1 k k 100

28 LIFE CYCLE ANALYSIS EMISSIONS Atmospheric pollutants Impacts CO 2 CO NO x SO x VOC Suspended matter Global warming Smog Acidification Eutrophication

29 LIFE CYCLE ANALYSIS Example: LCA of 1 kg of a generic insulation material INVENTORY ANALYSIS Emissions Value (in kg) carbon monoxide (CO) 0.12 carbon dioxide (CO 2 ) 0.60 ammonia (NH 3 ) 0.01 methane (CH 4 ) 0.05 nitrogen oxides (NO x ) 1.02 phosphorus (P) 0.35 sulfur dioxide (SO 2 ) 0.10 IMPACT ASSESSMENT GWP AP EP (kg SO 2 eq.) (kg PO 4 - eq.) (kg CO 2 eq.) carbon monoxide (CO) carbon dioxide (CO 2 ) ammonia (NH 3 ) methane (CH 4 ) nitrogen oxides (NO x ) phosphorus (P) sulfur dioxide (SO 2 ) e.g.: GWP: 0.12 x x x 23 = 1.93 kg CO 2 eq ENVIRONMENTAL IMPACTS GWP (kg CO 2 eq.) AP (kg SO 2 eq.) EP (kg PO 4 -eq.)

30 ENVIRONMENTAL LABELLING ISO series Establishing the general principles of environmental labels and declarations The ISO family covers three types of labeling schemes: Type I Multi-attribute label developed by a third party Environmental Labels and Declarations: Environmental Labeling Type I, Guiding Principles and Procedures - ISO 14024:1999 Type II Single-attribute label developed by the producer Environmental Labels and Declarations: Self-Declaration Environmental Claims, Terms and Definitions - ISO 14021:1999 Type III Eco-label whose awarding is based on a full life-cycle assessment Environmental labels and declarations - Type III environmental declarations - Principles and procedures ISO 14025:2006

31 ENVIRONMENTAL LABELLING ISO 14025: 2006 Examples of EPDs: Cold finished structural hollow sections cradle-to-gate analysis cradle-to-grave analysis

32 LIFE CYCLE ANALYSIS CEN/TC 350 SUSTAINABILITY OF CONSTRUCTION WORKS Building level Product level

33 LIFE CYCLE ANALYSIS CEN/TC 350 SUSTAINABILITY OF CONSTRUCTION WORKS: ASSESSMENT OF BUILDINGS EN : 2010 General framework EN :2011 Framework for environmental performance EN :2012 Framework for social performance EN :2012 Framework for economic performance Product level Building level EN 15978:2011 Calculation method EN 15804:2012 EPDs - Core rules for the product category EN 16309:2014 Calculation methodology pren 16627: Calculation method

34 LIFE CYCLE ANALYSIS MODULAR INFORMATION FOR THE DIFFERENT STAGES OF BUILDING ASSESSMENT (EN15978:2011) Impacts specific to building fabric and site Impacts specific to building in operation MODULE D

35 LIFE CYCLE ANALYSIS MODULAR INFORMATION FOR THE DIFFERENT STAGES OF BUILDING ASSESSMENT (EN15978:2011) Benefits and loads beyond the system boundary D Reuse- Recovery- Recycling- potential MODULE D includes: Any declared net benefits and loads from net flows leaving the product system that have not been allocated as coproducts and that have passed the end-of-waste state.

36 LIFE CYCLE ANALYSIS STEEL RECYCLING ALLOCATION PROCEDURE: CLOSED - LOOP The recycling material at end of life is credited to the system with an avoided burden; Any recycled content adds the same burden to the product system in order to share the burden with the previous life cycle; This is a closed material loop method as recycling saves the production of virgin material with the same properties. Source: worldsteel (2011) Methodology supported by the metals industry [see Declaration by the Metals Industry on Recycling Principles (Atherton, 2006)]

37 Sustainability and LCA of steel structures

38 PRODUCT LEVEL Source: UK Steel (

39 PRODUCT LEVEL Source: UK Steel (

40 PRODUCT LEVEL STEELMAKING PROCESS BLAST FURNACE ELECTRIC ARC FURNACE e.g. Energy intensity in the production of 1 tonne of crude steel GJ GJ Source: Worldsteel Organization, 2011

41 PRODUCT LEVEL STEEL RECYCLING ALLOCATION PROCEDURE: CLOSED-LOOP BLAST FURNACE ( * ) ELECTRIC ARC FURNACE ( * ) ~ 0% scrap ~ 100% scrap X pr ( * ) theoretical assumptions X re LCI scrap = Y (X pr X re )

42 PRODUCT LEVEL STEEL RECYCLING ALLOCATION PROCEDURE: CLOSED-LOOP General case of steel production including recycling: Iron ore (kg) S (kg scrap) Steel production RR (X) Credit LCI for 1 kg of steel = X (RR S) Y (X pr X re ) Net scrap

43 PRODUCT LEVEL STEEL RECYCLING ALLOCATION PROCEDURE: CLOSED-LOOP General case of steel production including recycling e.g.: LCI calculation of 1 kg hot rolled coil for CO 2 emissions Iron ore (kg) S = kg scrap 1 kg hot rolled coil RR = 0.85 kg X = kg CO 2 LCI for 1 kg of steel = ( ) x 1.41 ( * ) = 0.86 kg CO 2 ( * ) value from Worldsteel Organization for CO 2 emissions Module D Source: worldsteel (2011)

44 EXAMPLE 1: LCA OF A BEAM LCA of a steel beam with a total length of 21 m and a IPE 600 section, in steel S355.

45 EXAMPLE 1: LCA OF A BEAM Cradle-to-gate analysis

46 EXAMPLE 1: LCA OF A BEAM Cradle-to-gate analysis

47 EXAMPLE 1: LCA OF A BEAM Cradle-to-gate + recycling (module D)

48 EXAMPLE 1: LCA OF A BEAM Cradle-to-gate + recycling (module D)

49 EXAMPLE 2: LCA OF A COLUMN LCA of a steel column with a total height of 30 m and a HEB 320 section, in steel S355.

50 EXAMPLE 2: LCA OF A COLUMN

51 EXAMPLE 2: LCA OF A COLUMN Maintenance of the column over the lifespan of analysis

52 EXAMPLE 2: LCA OF A COLUMN

53 EXAMPLE 3: COMPARATIVE LCA OF A COLUMN Comparative LCA of a steel column with a total height of m, in steel S355, considering: HEB 280 SHS 260 x 12 CHS x 12 Note: All alternative designs for the column fulfill the same functional unit - a restrained column, m long, with a load bearing capacity of an axial force of 1704 kn and a bending moment of 24.8 knm (around the strong axis for the profile column).

54 EXAMPLE 3: COMPARATIVE LCA OF A COLUMN Indicators describing environmental impacts Indicator Unit HEB 280 SHS 260x12 CHS 323.9x12 ADP elements [kg Sb Eq.] -7.57E E E-03 ADP fossil [MJ] 6.06E E E+03 AP [kg SO2 Eq.] 1.41E E E+00 EP [kg PO4- Eq.] 1.41E E E-01 GWP [kg CO2 Eq.] 4.47E E E+02 ODP [kg CFC-11 Eq.] 2.41E E E-05 POCP [kg C2H4 Eq.] 2.18E E E-01 Note: considering hot rolled sections kg/m kg/m kg/m

55 Comparison between cold-formed and hot finished sections (data from EPDs) Note: These results are not about the previous case study, they are based on a similar case-study Primary energy Use (MJ) En pelare N Ed =5000kN, M Ed =300kNm 60000, ,0 1600,0 1400,0 1200, ,0 1000,0 Climate change (kg CO2 equiv. ) 30000,0 800, , ,0 600,0 400,0 200,0 0,0 Wide flange (H) Welded rectangular hollow (HSK) Circular hollow (HFSHS) Circular Hollow (CFSHS) 0,0 Wide flange (H) Welded rectangular hollow (HSK) Circular hollow (HFSHS) Circular Hollow (CFSHS) Wide flange HD kg Welded rectangular HSK kg Cold formed circular hollow d=559mm t=12,5mm 842 kg Hot finished circular hollow d=559mm t=12,5mm 842 kg More recent data may be found in:

56 BUILDING LEVEL SIMPLIFIED APPROACH BASED ON MACRO-COMPONENTS Internal wall system (load-bearing walls) Roof System Internal wall system (non-bearing walls) External wall system (load-bearing Floor walls) system

57 BUILDING LEVEL SIMPLIFIED APPROACH BASED ON MACRO-COMPONENTS A1-A3 A4 B4 C2 C4 D POCP [kg Ethene-Equiv.] ODP [kg R11-Equiv.] GWP [kg CO2-Equiv.] EP [kg Phosphate-Equiv.] AP [kg SO2-Equiv.] ADP fossil [MJ] ADP elements [kg Sb-Equiv.] -20% 0% 20% 40% 60% 80% 100% Note: Environmental Impacts Abiotic Resource Depletion Potential for elements (ADP elements) Abiotic Resource Depletion Potential of fossil fuels (ADP fossil fuels) Acidification potential of land and water (AP) Eutrophication potential (EP) Global warming potential (GWP) Depletion potential of the stratospheric ozone layer (ODP) Formation potential of tropospheric ozone photochemical oxidants (POCP) Source: Gervásio et al. (2014)

58 Eurocodes Design of steel buildings with worked examples Brussels, October 2014 EXAMPLE 4: LCA OF A STEEL BUILDING Floor area of 21 m by 45 m; Total height of 33; 8 storeys. Sustainability aspects, inventory, comparisons M. Veljkovic & H. Gervásio

59 EXAMPLE 4: LCA OF A STEEL BUILDING Life cycle analysis of steel structure Beams Length (m) IPE IPE IPE HEA Columns Length (m) HEB HEB HEB Total weight of steel structure 405 tonnes Scope of the analysis: Cradle-to-grave + Recycling Assumptions: Type of coating: Water based paint, with a partial replacement of 50% every 20 years; Transportation Module A4: 100% of steel transported by truck over 200 km; Transportation Module C2: 100% of steel transported by truck over 100 km; RR = 99% for all steel elements

60 EXAMPLE 4: LCA OF A STEEL BUILDING Life cycle analysis of steel structure Indicators describing environmental impacts Indicator Unit A1 A3 A4 B2 C2 C4 D TOTAL ADP elements [kg Sb Eq.] 4.47E E E E E E E+00 ADP fossil [MJ] 7.95E E E E E E E+06 AP [kg SO2 Eq.] 1.87E E E E E E E+03 EP [kg PO4 Eq.] 1.46E E E E E E E+02 GWP [kg CO2 Eq.] 6.55E E E E E E E+05 ODP [kg CFC 11 Eq.] 1.44E E E E E E E 02 POCP [kg C2H4 Eq.] 3.51E E E E E E E+02

61 EXAMPLE 4: LCA OF A STEEL BUILDING Life cycle analysis of steel structure Indicators describing primary energy demand Indicator Unit A1 A3 A4 B2 C2 C4 D TOTAL Total demand (g.c.v) [MJ] 8.63E E E E E E E+06 Total demand (n.c.v) [MJ] 8.21E E E E E E E+06 Non ren. Resources (g.c.v) [MJ] 8.37E E E E E E E+06 Non ren. Resources (n.c.v) [MJ] 7.96E E E E E E E+06 Ren. Resources (g.c.v) [MJ] 2.54E E E E E E E+05 Ren. Resources (n.c.v) [MJ] 2.54E E E E E E E+05

62 EXAMPLE 4: LCA OF A STEEL BUILDING Life cycle analysis of steel structure Summary of results for the steel structure

63 EXAMPLE 4: LCA OF A STEEL BUILDING Definition of building geometry

64 EXAMPLE 4: LCA OF A STEEL BUILDING Selection of building macro-components Façade Internal walls Internal floors

65 EXAMPLE 4: LCA OF A STEEL BUILDING Results per macro-components LCA of Façades Indicators describing environmental impacts Indicator Unit A1 A3 A4 B2 C2 C4 D TOTAL ADP elements [kg Sb Eq.] 5.21e e e e e e e 2 ADP fossil [MJ] 4.43e e e e e e e+6 AP [kg SO2 Eq.] 8.71e e e e e e e+2 EP [kg PO4 Eq.] 6.96e e e e e e e+1 GWP [kg CO2 Eq.] 2.95e e e e e e e+5 ODP [kg CFC 11 Eq.] 5.98e e e e e e e 3 POCP [kg C2H4 Eq.] 5.17e e e e e e e+2

66 EXAMPLE 4: LCA OF A STEEL BUILDING Results per macro-components LCA of Partitions Indicators describing environmental impacts Indicator Unit A1 A3 A4 B2 C2 C4 D TOTAL ADP elements [kg Sb Eq.] 3.69e e e e e e e 1 ADP fossil [MJ] 6.77e e e e e e e+5 AP [kg SO2 Eq.] 1.56e e e e e e e+1 EP [kg PO4 Eq.] 9.77e e e e e e e+0 GWP [kg CO2 Eq.] 5.25e e e e e e e+4 ODP [kg CFC 11 Eq.] 4.69e e e e e e e 3 POCP [kg C2H4 Eq.] 6.18e e e e e e e+1

67 EXAMPLE 4: LCA OF A STEEL BUILDING Results per macro-components LCA of Internal Floor Indicators describing environmental impacts Indicator Unit A1 A3 A4 B2 C2 C4 D TOTAL ADP elements [kg Sb Eq.] 6.25e e e e e e e+1 ADP fossil [MJ] 7.27e e e e e e e+6 AP [kg SO2 Eq.] 1.53e e e e e e e+3 EP [kg PO4 Eq.] 1.78e e e e e e e+2 GWP [kg CO2 Eq.] 7.20e e e e e e e+5 ODP [kg CFC 11 Eq.] 8.77e e e e e e e 2 POCP [kg C2H4 Eq.] 2.13e e e e e e e+2

68 EXAMPLE 4: LCA OF A STEEL BUILDING Results for the building LCA of building (structure + macro components) Indicators describing environmental impacts Indicator Unit A1 A3 A4 B2 C2 C4 D TOTAL ADP [kg Sb Eq.] elements 2.34E E E E E E E+00 ADP fossil AP EP GWP ODP POCP [MJ] [kg SO2 Eq.] [kg PO4 Eq.] [kg CO2 Eq.] [kg CFC 11 Eq.] [kg C2H4 Eq.] 2.03E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E+03

69 EXAMPLE 4: LCA OF A STEEL BUILDING Results for the building LCA of building (structure + macrocomponents)

70 References worldsteel (2011), Life cycle assessment methodology report, World Steel Association, Brussels. Atherton, J. (2006). Declaration by the Metals Industry on Recycling Principles. The International Journal of Life Cycle Assessment, 12(1), doi: /lca Gervásio, H., Santos, P., Simões da Silva, L. and Gameiro Lopes, A. (2010), Influence of insulation on the balance between embodied energy and operational energy in light steel residential buildings, Advanced Steel Construction, 6(2), pp Gervásio, H., Martins, R., Santos, P., Simões da Silva, L. (2014), A macro component approach for the assessment of building sustainability in early stages of design, Building and Environment 73, pp , DOI information: /j.buildenv

71 Thank you for your attention!!